1. Department of Pediatrics, Pediatric Gastroenterology, Allergology and Nutrition, Medical University of Gdansk, 80-210 Gdansk, Poland
2. Department of Pediatrics, Hematology and Oncology, Medical University of Gdansk, 80-210 Gdansk, Poland
3. Department of Pediatrics, Nutrition and Metabolic Diseases, The Children’s Memorial Health Institute, 04-730 Warsaw, Poland
4. Department of Pediatrics, Endocrinology, Diabetology, Metabolic Diseases and Cardiology of Developmental Age, Pomeranian Medical University, 71-252 Szczecin, Poland
5. Department of Pediatric Allergology, Gastroenterology and Nutrition, Medical University of Lodz, 91-738 Lodz, Poland
6. Department of Anesthesiology and Critical Care Medicine, Clinical Provincial Hospital No. 2 in Rzeszow, 35-301 Rzeszow, Poland
7. Department of Pediatric Hematology and Oncology, Collegium Medicum, Nicolaus Copernicus University Torun, 85-000 Bydgoszcz, Poland
8. Department of Pediatric Hematology and Oncology, Zabrze, Medical University of Silesia, 40-752 Katowice, Poland